Show pending migrations in rails

Ruby on-RailsRails Migrations

Ruby on-Rails Problem Overview

Is there a rake task that shows the pending migrations in a rails app?

Ruby on-Rails Solutions

Solution 1 - Ruby on-Rails

rake db:migrate:status (Rails 3 to 5) or rails db:migrate:status (Rails 5) will accomplish this. See this commit.

up means the migration has been run. down means the migration has not been run.

Solution 2 - Ruby on-Rails

There is rake db:abort_if_pending_migrations (at least in Rails 2.3.3, not sure when it was introduced). The description says 'Raises an error if there are pending migrations'. This seems to be used more as a prerequisite for other tasks, but I'm guessing you could use it for your purposes.

EDIT: Here is an example of the output after having just generated and not run a 'test' migration

rails_project theIV$ rake db:abort_if_pending_migrations
(in /Users/theIV/Sites/rails_project/)
You have 1 pending migrations:
  20090828200602 Test
Run "rake db:migrate" to update your database then try again.

Solution 3 - Ruby on-Rails

This command will list all migrations with their status (UP or DOWN)

Rails 3 and 4

rake db:migrate:status

Rails 5

rake db:migrate:status

# Or

rails db:migrate:status

Solution 4 - Ruby on-Rails

rake db:version will accomplish this on Rails 2.

Solution 5 - Ruby on-Rails

This works for rails 5.2

ActiveRecord::Base.connection.migration_context.needs_migration?

Solution 6 - Ruby on-Rails

If you want to see how much migration is done or pending you can see using below command.

rails db:migrate:status

More on this link: Rails Active Record Migration

Solution 7 - Ruby on-Rails

If you need a bash one-liner to determine whether to run a migration or not (e.g., only migrate in a Heroku release phase command when there is a pending migration), this works:

(rails db:migrate:status | grep "^\s*down") && rails db:migrate || echo "No pending migrations found."

Solution 8 - Ruby on-Rails

Try rake -h (help) and have a look at rake -n (= rake --dry-run). So probably something like rake -n db:migrate should get you what you want.

Solution 9 - Ruby on-Rails

Might not quite be what OP is asking for, but if you just need to quickly check if any migrations are pending for use in a rake task, without resorting to

rake db:migrate:status | grep down (might not work if you're on Windows)

ActiveRecord::Migration.check_pending! (raises ActiveRecord::PendingMigrationError that you need to rescue)

you can use needs_migration? method: https://apidock.com/rails/v4.0.2/ActiveRecord/Migrator/needs_migration%3F/class

Solution 10 - Ruby on-Rails

Following command to check migration status:

rake db:migrate:status

OR

when you run your server, it will display a message to run your pending migration first.

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Content TypeOriginal AuthorOriginal Content on Stackoverflow
QuestionreadonlyView Question on Stackoverflow
Solution 1 - Ruby on-RailsjrdiokoView Answer on Stackoverflow
Solution 2 - Ruby on-RailstheIVView Answer on Stackoverflow
Solution 3 - Ruby on-RailsDeepak MahakaleView Answer on Stackoverflow
Solution 4 - Ruby on-RailsgerrysterView Answer on Stackoverflow
Solution 5 - Ruby on-RailsSairamView Answer on Stackoverflow
Solution 6 - Ruby on-RailsForamView Answer on Stackoverflow
Solution 7 - Ruby on-RailsniborgView Answer on Stackoverflow
Solution 8 - Ruby on-RailsJohn LockwoodView Answer on Stackoverflow
Solution 9 - Ruby on-Railswondersz1View Answer on Stackoverflow
Solution 10 - Ruby on-Railspuneet18View Answer on Stackoverflow